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Chapter 11 Chemical Bonding II.docx

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David Brock

1Chapter 11 Chemical Bonding II Additional AspectsBernard HoApril 6 2011What a Bonding Theory Should DoImagine bringing together two H atoms that are initially far apartWhen H atoms are far apart the two do not interact with each other and by convention the net energy of interaction between the two H atoms is zeroAs the two H atoms approach each other three types of interactions occuroEach electron is attracted to the other nucleusoElectrons repel each otheroThe two nuclei repel each otherNet energy of interaction of two H atomsoStarts at zero when atoms are very far apartoAt intermediate distances attractive forces predominate and potential energy is negativeoAt very small internuclear distances repulsive forces exceed attractive forces and potential energy is positiveoAt one particular internuclear distance potential energy reaches its lowest valueCondition in which two H atoms combine into a H molecule 2through a covalent bondoThe nuclei continuously move back and forth as the molecule vibrates but the average internuclear distance remains constantoThis internuclear distance corresponds to bond lengthoPotential energy corresponds to the negative of the bonddissociation energySeveral approaches to understanding bondingoStrength of Lewis theory is in the ease with which it can be applied
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